https://wenku.baidu.com/view/45fb5ccd6037ee06eff9aef8941ea76e58fa4aae.html
最新旋挖成孔灌注桩工程技术规程
https://wenku.baidu.com/view/6390064fb0717fd5370cdc59.html?sxts=1565741938459
http://bbs.yantuchina.com/read.php?tid=319797
http://bbs.yantuchina.com/read.php?tid=184077
.看地勘资料岩的深度，看泥浆中的岩屑
看施工记录，一般到岩石后钻进速度明显减慢
